Shevchuk V. Methods and means of determining the presence of power quality distortion in power supply systems.

Shevchuk V. Methods and means of determining the presence of power quality distortion in power supply systems. Qualifying scientific work, the manuscript. PhD thesis in the field of knowledge 14 Electrical engineering in specialty 141 Electric power, electrical engineering and electromechanics. – National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, 2024. The problem of ensuring the quality of electricity is becoming more and more urgent with the introduction of various renewable energy sources, powerful non-linear consumers and decentralization of power supply systems. These changes complicate the task of ensuring stable electricity supply, which leads to significant losses from the deterioration of electricity quality. Against the background of changes in the economic mechanism of the energy industry, the problem of reducing electricity losses in electrical networks remains relevant, becoming an important task for ensuring the financial stability of energy supply organizations. The level of electricity losses in electrical networks is a key indicator of the economy of their activity and the efficiency of electricity metering systems. This indicator indicates problems that require urgent solutions in the field of development, reconstruction and technical renewal of electric networks, improvement of their operation and management methods, improvement of the accuracy of electricity accounting and efficiency of collection of funds for consumed electricity. The dissertation is aimed at the development and improvement of methods for determining the quality of electricity in modern power supply systems. The study covers the analysis of power quality parameters such as voltage dips and overshoots, harmonics, flicker, voltage asymmetry and others that affect the efficiency and safety of electrical systems. The work considers the existing methods of determining the quality of electricity, including standards, local methods, and monitoring systems. The main aspect is the use of the spatial vector model for the analysis and monitoring of the quality of electricity in three-phase systems, as well as the detection of voltage dips. The research involves the use of sensors and analytical software to effectively monitor and analyze power quality. The relationship between voltage dips and power consumption, the use of real-time power measurements to detect and estimate distortions is also considered. The dissertation examines various methods of determining the presence of power quality distortions and their application in real conditions. Special attention is paid to analyzing the results and comparing the methods to determine their advantages and limitations. The findings of the study determine the importance of the work for the development of the electric power industry and the improvement of the quality of power supply, ensuring the reliability and efficiency of electrical systems in various branches of electricity production and consumption. Keywords: Power quality, short circuits, voltage dips and overshoots, NEE distortion, identification, classification, power consumption modes, electric load graphs, transient processes in power consumption systems, voltage deviations, Smart Grid, power supply systems, Clark's method, phase angle, zero sequence.